Google does filter out most autoblog pages due to duplicate content. This is a filter, which means that a page can exist and rank well for a random period of time until the filter identifies it and moves it to the supplemental index, as bogart mentioned. I've seen numerous autoblogs eventually get de-indexed by Google. The trick to beating this thus far seems to be to add lots of additional content every day. Like everything else with Google, there is a randomness factor. Some sites get targeted and hit hard by Google, while others do not.
If you are using AdSense on autoblogs, you risk having your AdSense account closed. As far as I can tell, Google has not yet actively pursued this, but they usually announce a policy change a few months prior to enacting it. Note that the date of this article is January 11, 2011.
AdSense Facts & Fiction Part V: Unoriginal content - Inside AdSense
"It's inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians." -Henrik Ibsen